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clients/window: atomically update pointer cursor

Simon Ser requested to merge emersion/weston:client-atomic-cursor into main

Currently, Weston clients update the pointer cursor by first issuing a wl_surface.commit request to update the buffer, then a wl_pointer.set_cursor request to update the hotspot. This causes an issue because buffer and hotspot aren't updated atomically: in-between the two requests, the buffer is new but the hotspot is old.

To fix this issue, create a new surface each time the cursor is updated.

Signed-off-by: Simon Ser contact@emersion.fr

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